How to add Advertisement in post

[svk]

Need help how to add Advertisement in post section ? Where I need to put 

{advertisement="KEY"}

Thanks.

[AutoItScript]

This is what I'm using for a header and footer in the posts view. Pity global header and footer is unusable for this  

In the CSS templates of the theme:

Topics header: first line of
forums / front / topics / topic

Topics footer: Last line of
forums / front / topics / topic
 

[svk]

Thanks @AutoItScript Im add KEY in /forums / front / topics / post/

before:

{{if !( $comment->hidden() === 1 && ( $comment->canUnhide() || $comment->canDelete() ) )}}
            {{if $comment instanceof \IPS\Content\Reputation and settings.reputation_enabled}}
                {template="reputation" group="global" app="core" params="$comment, 'ipsPos_right ipsResponsive_noFloat'"}
            {{endif}}
        {{endif}}

I hope is good place